CN101237314A - A method and access device for guaranteeing duplication service transmission - Google Patents
A method and access device for guaranteeing duplication service transmission Download PDFInfo
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- CN101237314A CN101237314A CNA200810056293XA CN200810056293A CN101237314A CN 101237314 A CN101237314 A CN 101237314A CN A200810056293X A CNA200810056293X A CN A200810056293XA CN 200810056293 A CN200810056293 A CN 200810056293A CN 101237314 A CN101237314 A CN 101237314A
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Abstract
The invention discloses a technical proposal for guaranteeing the transmission of a copy service. The technical proposal mainly comprises; a first access device transmits a copy service through one or a plurality of links between the first access deice and a second access device; and during the transmission process, the first access device detects the availability of a link and, when the link is not available, switches the copy service in the link to an available link. The technical proposal of the invention can guarantee the smooth operation of the copy service by detecting the availability of the link and, when the link is not available, switching the copy service in the link to an available link, thereby solving the problem of interruption of the copy service caused by the poor quality of the link.
Description
Technical field
The present invention relates to data transmission technology, refer to a kind of method and access device that ensures the duplication service transmission especially.
Background technology
Along with deepening continuously of IT application process, the running of operation flow more and more highly depends on data in the enterprise, makes data become the important foundation stone that supports corporate operation.Data had both comprised the data of disperseing to be stored in the employee work station, also comprised centralized stores data in the disk array in the server device.How to guarantee the fail safe of mass data in face of various disasters, the continuity operation of supporting business just becomes realistic problem that needs to be resolved hurrily in the prior art, the disaster tolerance engineering of just being paid close attention to now.
Usually, will support the information system of routine work running to be called production system.Because of catastrophic event, when being destroyed, be used for the system of operation of data, environment and the system of the system that resumes production rapidly in production system, be called disaster tolerance system as fire, earthquake etc.Disaster tolerance system is usually by duplicating the data in the production system, is used for the system that resumes production when production system is destroyed.In reproduction process, for when production system is destroyed, guarantee the availability of disaster tolerance system, production system links to each other with disaster tolerance system by go-between usually, and production system and disaster tolerance system are positioned on the different geographical position.
Referring to Fig. 1, Figure 1 shows that the schematic diagram that production system links to each other with disaster tolerance system by go-between.Production system links to each other with go-between by access device A, and disaster tolerance system is by access device B and go-between.Because the complexity of network factors and environmental factor changes, the link-quality of go-between such as wide area network is uncertain, can't ensure carrying out smoothly of reproduction process between production system and the disaster tolerance system.Therefore like this, disaster tolerance system might cause not duplicating the data in the production system because of the factor of link-quality, suffers broken to encircle in production system, when needing disaster tolerance system to recover, and will greatly influence disaster tolerance system the resume production efficient and the ability of system.And then, in the face of uncertain network environment, need provide a kind of technology can effectively ensure the transmission of duplication service.
Summary of the invention
In view of this, the invention provides a kind of method that ensures the duplication service transmission, use the smooth transmission that method provided by the present invention can effectively ensure duplication service.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of method that ensures the duplication service transmission, this method comprises:
First access device by and second access device between one or more link transmission duplication service;
First access device detects the available situation of link, when the link of transmission copying business is unavailable, the duplication service on the link is switched to available link transmit.
In addition, the present invention also provides a kind of access device, and this access device can effectively ensure the smooth transmission of duplication service.
A kind of access device, this access device comprises:
Transmission unit, be used for by and the opposite end access device between one or more link transmission duplication service; And carry out the switching of link according to the indication of monitoring unit;
Monitoring unit is used to detect the available situation of link, when the link of transmission copying business is unavailable, indicates described transmission unit that the duplication service on this link is switched to available link and transmits.
A kind of guarantee duplication service technical scheme of transmission provided by the present invention mainly comprises: first access device by and second access device between one or more link transmission duplication service; In transmission course, first access device detects the available situation of link, when the link of transmission copying business is unavailable, the duplication service on the link is switched to available link transmit.Technical solution of the present invention is in the process of duplication service, by detecting with situation to link, when the link of transmission copying business is unavailable, duplication service on this link switched on the available link transmit, ensure the smooth execution of duplication service, overcome the problem that causes duplication service to interrupt owing to the link-quality difference.
Description of drawings
Fig. 1 is an annexation schematic diagram between production system and the disaster tolerance system in the prior art;
Fig. 2 is the method flow diagram of the embodiment of the invention one;
Fig. 3 is the access device structure chart of the embodiment of the invention one;
Fig. 4 is the method flow diagram of the embodiment of the invention two.
Embodiment
In the detailed description of this part, only, illustrate and described preferred embodiment of the present invention by to implementing the example of the desired best mode of inventor of the present invention.It will be appreciated that and not deviate under the prerequisite of the present invention, it is made amendment with regard to each conspicuous aspect.Correspondingly, it is exemplary in itself that drawing and description should be regarded as, rather than restrictive.
In the technical scheme of the embodiment of the invention, first access device can by and second access device between one or more link transmission duplication service; And in transmission course, first access device detects the available situation of link, when the link of transmission copying business is unavailable, the duplication service on the link is switched to available link transmit.In the transmission course of duplication service, can detect with situation link, when the link of transmission copying business is unavailable, by being switched on the available link, the duplication service on this link transmits, ensure the smooth execution of duplication service, overcome the problem that causes duplication service to interrupt owing to the link-quality difference.
Wherein, when first access device adopted the common transmission copying of multilink professional, technical scheme of the present invention not only can ensure the smooth transmission of duplication service, can also improve the implementation progress of duplication service, and the disaster tolerance ability is provided.In order to ensure that the duplication service between production system and the disaster tolerance system transmits smoothly, can set up special-purpose multilink for duplication service, be used for selecting one or more to come the transmission copying business therein according to the demand of reality, and when the link of transmission copying business is unavailable, carry out the switching of link.Certainly, also can use the link of having set up between first access device and second access device, with effective conserve network resources; Also can in these links, select some links to use for duplication service.At this moment, except meeting transmission copying business, also might transmit other applied business in these links, just duplication service and other applied business shared links.
When first access device can be used situation at the detection link, can adopt the mode that periodically detects, also can carry out irregular detection according to gerentocratic indication.When detecting, can detect the link that can be used for the transmission copying business that all link to each other with second access device, when the link that detects the transmission copying business is unavailable, directly, the duplication service on this link is switched to available link according to the result who detects.Also can, the link of detected transmission duplication service at first only, when the link that has the transmission copying business is unavailable, detect the available situation that does not detect link that can be used for the transmission copying business between first access device and second access device again, duplication service is switched on the detected available link transmit then.It should be noted that when by multilink transmission copying business, had duplication service on the link that might switch to, this link will transmit the business that the switching of script self loaded service comes this moment.Here, what can be used for that the link of transmission copying business just is meant is above-mentioned, is all links set up between the professional dedicated link of setting up of transmission copying or first access device and second access device or the link that is used for the transmission copying business selected in the link that first access device and second access device have been set up.
In the technical scheme of the embodiment of the invention, whether link is available mainly can determine according to some detection meanss.For example can be that first access device sends the link test message by tested chain road direction second access device, return the link of response message in the given time and can use that the link that does not return response message in the given time is unavailable; Also can be the transmission control protocol (TCP that first access device obtains tested link, Transfer Control Protocol) connects retransmission rate, determine that TCP connection retransmission rate does not reach the link of presetting thresholding and can use, it is unavailable that TCP connection retransmission rate reaches the link of presetting thresholding.Be not difficult to obtain from top example, indication link of the present invention can with being meant whether link can be used for the transmission copying business, is not that sense stricto link opens circuit and breaks down.Wherein, the link of indication of the present invention can be meant physical link.
Below be example with these two kinds of concrete detection methods, technical scheme of the present invention is described in detail.Here, it should be noted that the technical scheme in the embodiment of the invention, be applicable to that promptly production system transfers data to the duplication service of disaster tolerance system, this moment, first access device was for connecting the access device of production system and go-between; Also be applicable to when disaster tolerance system is resumed production system, transfer data to the duplication service of production system, this moment, first access device was for connecting the access device of disaster tolerance system and go-between.In addition, access device described in the present invention can be the mutual machine that connects production system and go-between and disaster tolerance system and go-between, router etc.
In the introduction of following examples, serve as the situation that connects the equipment of production system and go-between mainly with first access device.When first access device is that specific implementation is identical therewith, and then repeats no more when connecting the equipment of disaster tolerance system and go-between.
Referring to Fig. 2, Fig. 2 is the flow chart of the embodiment of the invention one, the detection mode that is based on the link test message of realization.Now specifically be described below:
In step 201, first access device by and second access device between one or more link transmission duplication service.
First access device can carry out the test of link-quality to the link between first access device and second access device before selecting one or more link transmission duplication service, select one or more link of better quality to transmit therein.The method of carrying out the link-quality test can adopt the method that sends test packet equally, returns the short more link of response, and link-quality is good more.
In step 202, in the process of transmission copying business, first access device sends the link test message by the link of transmission copying business, and definite link that returns response message in the given time can be used, and the link that does not return response message in the given time is unavailable.When the detection link can be used situation, can adopt the mode that periodically detects, also can carry out irregular detection according to gerentocratic indication.The size in cycle is determined according to the needs and the empirical value of real network environment.
Wherein, determine that according to the scheduled time whether available link mode a lot, specifically lift two examples and describe at this.At first be, when sending the link test message, start timer, arrive the scheduled time at timer, and the response of not receiving the link test message from this link determines that then this link is unavailable; When receiving the response of link test message, then definite this link can be used.Next is, writes down the time difference that each link sends link test message and returns response, and time difference and the scheduled time are compared, and the link that surpasses the scheduled time is unavailable, can use above the scheduled time.The setting of scheduled time size relates to whether available judgement of link, therefore when specifically being provided with, can rule of thumb being worth and the requirement of link-quality is provided with.
When first access device need carry out link test to multilink, can distinguish by the sign of additional corresponding concrete link in the link test message, the response of link test message is to receive on which bar link.Certainly, can also distinguish the link test message that transmits on the different links, be not described in detail in this with other modes.In addition, present embodiment can also be based on the transmission link test message of service feature.When the data of duplication service correspondence based on minicomputer system (iSCSI, Internet Small ComputerSystem Interface Internet) during memory technology, described first access device sends test packet based on the iSCSI stored messages by tested chain road direction second access device.
In step 203, when the link of transmission copying business is unavailable, first access device can be used for the transmission copying business between first access device and second access device not detection link sends the link test message, definite link that returns response message in the given time can be used, and the link that does not return response message in the given time is unavailable.
Here, the link that can be used for the transmission copying business of indication just is meant all links set up between the above-mentioned dedicated link of setting up for transmission copying is professional or first access device and second access device or the link of selecting that is used for the transmission copying business in the link that first access device and second access device have been set up.
In step 204, the duplication service on the unavailable link in the step 202 is switched to available link transmit.
Available link and the definite available link of step 203 that the available link is here determined by step 202 are formed.When carrying out the business switching, can select wherein any available link to switch.Also can be when testing, write down the time of returning the test packet response of each link, when carrying out link switchover, then duplication service can be switched to and return the shortest link of response time and transmit.Here, the length of each link return link test packet response time can be represented the link-quality of link.Duplication service being switched to when transmitting on the available link, can switch on the link and transmit, also can be the quality according to link-quality, business is switched on the multilink transmit.In addition, the link priority that can also determine according to other factors switches to business on a link or the multilink and to transmit.Concrete bar number can be determined according to practical application.
Above-mentioned flow process is primarily aimed at when the link of detected transmission duplication service is unavailable, detects the scene that does not detect link between first access device and second access device again.When first access device detect and second access device between all when can be used for the available situation of link of transmission copying business, the concrete method that detects is identical with said method, just first access device is when needs detect, detect the link that all can be used for the transmission copying business, so just can be when the link of transmission copying business be unavailable, directly, duplication service is switched on the current available link according to detection case.
Referring to Fig. 3, Fig. 3 is the structure chart of first access device in the present embodiment, and this equipment comprises transmission unit and monitoring unit.Wherein, transmission unit, be used for by and the opposite end access device between one or more link transmission duplication service; And carry out the switching of link according to the indication of monitoring unit.Monitoring unit is used to detect the available situation of link, when the link of transmission copying business is unavailable, indicates described transmission unit that the duplication service on this link is switched to available link and transmits.
Wherein, described monitoring unit, all that are used between local terminal access device and the opposite end access device can be used for the available situation of the link of transmission copying business; Perhaps, obtain the link of transmission copying business when unavailable, detect the available situation that does not detect link that can be used for the transmission copying business between local terminal access device and the opposite end access device again in detection.
When carrying out link detecting, monitoring unit is used for sending the link test message by tested chain road direction opposite end access device, and the link of determining not return in the given time response message is unavailable, returns the link of response message in the given time and can use.The concrete mode that detects can be referring to the relevant introduction in the present embodiment method.Here, monitoring unit can directly send the link test message by tested chain road direction opposite end access device; Also the link test message can be sent to transmission unit, send the link test message by tested chain road direction opposite end access device by transmission unit; And return the response of the link test message that the opposite end access device sends to monitoring unit.
Referring to Fig. 4, Fig. 4 is the flow chart of the embodiment of the invention two, the detection mode that is based on the TCP re-transmission of realization.Now specifically be described below:
In step 401, first access device by and second access device between one or more link transmission duplication service.
First access device can carry out the test of link-quality to the link between first access device and second access device before selecting one or more link transmission duplication service, select one or more link of better quality to transmit therein.The method of carrying out the link-quality test can adopt the method that sends test packet equally, returns the short more link of response, and link-quality is good more.
In step 402, in the process of transmission copying business, the TCP that first access device detects current transmission copying service link connects retransmission rate, determines that TCP connection retransmission rate does not reach the link of presetting thresholding and can use, and it is unavailable that TCP connection retransmission rate reaches the link of presetting thresholding.When the detection link can be used situation, can adopt the mode that periodically detects, also can carry out irregular detection according to gerentocratic indication.The size in cycle is determined according to the needs and the empirical value of real network environment.
Wherein, the retransmission rate that obtains the TCP connection of tested link can be: monitor the TCP that has set up in the tested link and connect, the TCP linking number of re-transmission wherein takes place in record in the Preset Time section, and the TCP linking number that retransmits with described generation connects retransmission rate divided by the TCP that described monitored TCP linking number obtains this link.Wherein, determine whether certain bar TCP connection retransmits, can when the ack of confirmation message value has repetition, illustrate that then this TCP connection retransmits according to by monitoring the affirmation message in this TCP connection.
Here, TCP connect the threshold value of retransmission rate correspondence can be according to take place TCP when synchronous the TCP of correspondence connect retransmission rate and determine.If promptly this TCP connection retransmission rate has reached default thresholding, illustrate that then this link-quality is relatively poor, or it is synchronous that TCP has taken place, or it is synchronous to be about to that TCP takes place.Duplication service on this link need be switched on detected other available links and transmit.Certainly, TCP connection retransmission rate also can be determined according to the actual conditions and the empirical value of network environment.
In step 403, when the link of transmission copying business is unavailable, first access device detects the TCP retransmission rate that does not detect link that can be used for the transmission copying business between first access device and second access device, determine that TCP connection retransmission rate does not reach the link of presetting thresholding and can use, it is unavailable that TCP connection retransmission rate reaches the link of presetting thresholding.The not detection link here, just be meant in the link that can be used for the transmission copying business, the link of current not transmission copying business.
Here, the link that can be used for the transmission copying business of indication just is meant all links set up between the above-mentioned dedicated link of setting up for transmission copying is professional or first access device and second access device or the link of selecting that is used for the transmission copying business in the link that first access device and second access device have been set up.
Do not connect if set up TCP on the detected link, can determine that then this link is an available link.
In step 404, the duplication service on the unavailable link in the step 402 is switched to available link transmit.
Available link and the definite available link of step 403 that the available link is here determined by step 402 are formed.When carrying out the business switching, can select wherein any available link to switch.Also can be when detecting, the TCP that writes down each link connects retransmission rate.When carrying out link switchover, to be switched duplication service can be switched to the minimum link of TCP connection retransmission rate and transmit.Here, the height of each link TCP connection retransmission rate can be represented the link-quality of link.Transmitting in that duplication service is switched on the available link, can switch on the link and transmit, also can be the quality according to link-quality, business is switched on the multilink transmit.Concrete bar number can be determined according to practical application.In technical scheme of the present invention, except determining the link that switches to, it is also conceivable that other factors of link according to the quality situation of link, institute's loaded service amount etc. for example is to realize the load balancing of each link.
Above-mentioned flow process is primarily aimed at when the link of detected transmission duplication service is unavailable, detects the scene that does not detect link between first access device and second access device again.When first access device detect and second access device between all when can be used for the available situation of link of transmission copying business, the concrete method that detects is identical with said method, just first access device is when needs detect, detect the link that all can be used for the transmission copying business, so just can be when the link of transmission copying business be unavailable, directly, duplication service is switched on the current available link according to detection case last time.
Similar in the present embodiment among the structure chart of first access device and the embodiment one.The main distinction is that described monitoring unit is used to obtain the TCP connection retransmission rate of tested link, and it is unavailable to determine that TCP connection retransmission rate reaches the link of presetting thresholding, and TCP connection retransmission rate does not reach the link of default thresholding and can use.The concrete mode that detects can be referring to the relevant introduction in the present embodiment method.Here, the monitoring unit TCP link retransmission rate that detects tested link can obtain by the situation of monitor transmissions unit transmission copying business.
Technical scheme of the present invention, detect the available situation of link by first access device, when the link of transmission copying business is unavailable, duplication service on the link is switched to available link to be transmitted, ensure the smooth execution of duplication service, overcome the problem that causes duplication service to interrupt owing to the link-quality difference.Even production system and disaster tolerance system also can effectively ensure the smooth transmission of duplication service in the face of uncertain network environment.
Wherein, the detection mode based on TCP link retransmission rate relatively is applicable to the reproduction technology based on TCP.It can connect TCP carries out effective monitoring, ensures the smooth transmission of duplication service, and can immediately duplication service be switched to other available links, avoids the synchronous generation of TCP, has improved whole resource utilization.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1, a kind of method that ensures the duplication service transmission is characterized in that this method comprises:
First access device by and second access device between one or more link transmission duplication service;
First access device detects the available situation of link, when the link of transmission copying business is unavailable, the duplication service on the link is switched to available link transmit.
2, method according to claim 1 is characterized in that, the available situation that described first access device detects link comprises:
Between the detection of first access device and second access device all can be used for the available situation of the link of transmission copying business; Perhaps,
First access device obtains the link of transmission copying business when unavailable in detection, detects the available situation that does not detect link that can be used for the transmission copying business between first access device and second access device again.
3, method according to claim 1 and 2 is characterized in that, the available situation that described first access device detects link comprises:
First access device sends the link test message by tested chain road direction second access device, and definite link that returns response message in the given time can be used, and the link that does not return response message in the given time is unavailable.
4, method according to claim 3, it is characterized in that, when the data of duplication service correspondence during based on minicomputer system iSCSI memory technology, described first access device sends test packet based on the iSCSI stored messages by tested chain road direction second access device.
5, method according to claim 1 and 2 is characterized in that, the available situation that described first access device detects link comprises:
The transmission control protocol TCP that first access device obtains tested link connects retransmission rate, determines that TCP connection retransmission rate does not reach the link of presetting thresholding and can use, and it is unavailable that TCP connection retransmission rate reaches the link of presetting thresholding.
6, method according to claim 5 is characterized in that, the retransmission rate that the TCP of the tested link of described acquisition connects comprises:
Monitor the TCP that has set up in the tested link and connect, the TCP linking number of re-transmission wherein takes place in record in the Preset Time section, and the TCP linking number that retransmits with described generation connects retransmission rate divided by the TCP that described monitored TCP linking number obtains this link.
7, a kind of access device is characterized in that, this access device comprises:
Transmission unit, be used for by and the opposite end access device between one or more link transmission duplication service; And carry out the switching of link according to the indication of monitoring unit;
Monitoring unit is used to detect the available situation of link, when the link of transmission copying business is unavailable, indicates described transmission unit that the duplication service on this link is switched to available link and transmits.
8, access device according to claim 7 is characterized in that,
Described monitoring unit, all that are used between local terminal access device and the opposite end access device can be used for the available situation of the link of transmission copying business; Perhaps,
Obtain the link of transmission copying business when unavailable in detection, detect the available situation that does not detect link that can be used for the transmission copying business between local terminal access device and the opposite end access device again.
9, according to claim 7 or 8 described access devices, it is characterized in that,
Described monitoring unit is used for sending the link test message by tested chain road direction opposite end access device, and the link of determining not return in the given time response message is unavailable, returns the link of response message in the given time and can use.
10, according to claim 7 or 8 described access devices, it is characterized in that,
Described monitoring unit, the TCP that is used to obtain tested link connects retransmission rate, and determining to connect retransmission rate by TCP, to reach the link of default thresholding unavailable, and TCP connects the link that retransmission rate do not reach default thresholding and can use.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA200810056293XA CN101237314A (en) | 2008-01-16 | 2008-01-16 | A method and access device for guaranteeing duplication service transmission |
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| CNA200810056293XA CN101237314A (en) | 2008-01-16 | 2008-01-16 | A method and access device for guaranteeing duplication service transmission |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355364A (en) * | 2011-08-15 | 2012-02-15 | 杭州华三通信技术有限公司 | Method and device for detecting one-way fault |
| CN102547809A (en) * | 2010-12-24 | 2012-07-04 | 中国移动通信集团公司 | Data sending method and system |
| CN103686446A (en) * | 2013-12-06 | 2014-03-26 | 广州华多网络科技有限公司 | Method and system for retransmitting lost packet in video data transmission |
| CN104009873A (en) * | 2014-06-11 | 2014-08-27 | 华为技术有限公司 | Processing method and device for iSCSI |
| CN104202255A (en) * | 2014-08-26 | 2014-12-10 | 浪潮(北京)电子信息产业有限公司 | Efficient multi-link data transmission implementation method |
| WO2017032147A1 (en) * | 2015-08-25 | 2017-03-02 | 中兴通讯股份有限公司 | Method and apparatus for switching internet small computer system interface session link |
| CN110679132A (en) * | 2017-03-20 | 2020-01-10 | 思杰系统有限公司 | Automatic adjustment of hybrid WAN links by adaptively replicating packets on alternate links |
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2008
- 2008-01-16 CN CNA200810056293XA patent/CN101237314A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102547809A (en) * | 2010-12-24 | 2012-07-04 | 中国移动通信集团公司 | Data sending method and system |
| CN102547809B (en) * | 2010-12-24 | 2015-07-29 | 中国移动通信集团公司 | A kind of data transmission method for uplink and system |
| CN102355364A (en) * | 2011-08-15 | 2012-02-15 | 杭州华三通信技术有限公司 | Method and device for detecting one-way fault |
| CN103686446A (en) * | 2013-12-06 | 2014-03-26 | 广州华多网络科技有限公司 | Method and system for retransmitting lost packet in video data transmission |
| CN103686446B (en) * | 2013-12-06 | 2018-09-14 | 广州华多网络科技有限公司 | The packet loss repeating method and system of video data transmission |
| CN104009873A (en) * | 2014-06-11 | 2014-08-27 | 华为技术有限公司 | Processing method and device for iSCSI |
| CN104202255A (en) * | 2014-08-26 | 2014-12-10 | 浪潮(北京)电子信息产业有限公司 | Efficient multi-link data transmission implementation method |
| WO2017032147A1 (en) * | 2015-08-25 | 2017-03-02 | 中兴通讯股份有限公司 | Method and apparatus for switching internet small computer system interface session link |
| CN110679132A (en) * | 2017-03-20 | 2020-01-10 | 思杰系统有限公司 | Automatic adjustment of hybrid WAN links by adaptively replicating packets on alternate links |
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